body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  background-color: #f9fafb;
  color: #1f2937;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
header {
  background-color: #2563eb;
  color: white;
  padding: 1rem;
  text-align: center;
}
main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem;
}
#module-container {
  max-width: 900px;
  background: white;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  border-radius: 8px;
  text-align: left;
}
.navigation {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
}
button {
  background-color: #10b981;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
}
button:hover {
  background-color: #059669;
}
footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  color: #6b7280;
}